Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Oil pressure gauge in 2003 Chev. Siverado

I have a 2003 Chev. Siverado and the oil pressure pegs out at 80 and then drops to 0. I have checked the oil and it is good. When the pressure goes to 0 an alarm sounds and then goes off when the pressure goes back to 80. What do we need to do to fix this?

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03 chev silverados have recall on instrument psnel for speedometer defefect. All onstruments were affected on my 03. Chk with dealer for recall time and mileage limitations to resolve. Good Luck

Posted on May 08, 2009

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Most likely cause is a faulty oil pressure sending unit.

Posted on May 08, 2009

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1 Answer

Oil pressure gauge pegs at 80 PSI as soon as you turn the key on. I have replaced the gauge and confirmed the sending unit is working properly. Any ideas on where to look next?


Sounds like a grounded wire. Most senders change resistance to the ground circuit of the gauge. If it pegs there is no resistance to ground and probably a shorted wire.

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Sounds like a bad oil pressure sending unit.

Try unplugging it and see if the gauge drops to zero. If it does than replacing the oil pressure sending unit will most likely fix your problem.

It is not easy to see or get at but you can find it on the back side of the engine on the drivers side, kind of in between the valve cover and the intake plenum

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Bad sender is most likely, but could also be stuck oil pressure relief valve. You need to be sure, or the pump could break and destroy the engine.
Try a cheap mechanical gauge instead, screwed into the sender hole. If pressure good there, then check the sender with ohmmeter. If 0 or infinite ohms, replace sender. If not, see if gauge drops to 0 when sender disconnected. If not, then gauge bad.

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Oil pressure gauge is not getting good ground. Check wire.

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That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.

Pressure can be verified by reading it with a gauge tool.
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If instead the gauge reads 80 with engine off, that is a defective pressure gauge.

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